G5 ALS weirdest screen problem yet (i think)

Ok, so it's 4 years old and five weeks ago it began to have these weird HORIZONTAL lines. Take a look here:
http://s731.photobucket.com/albums/ww316/kimadog/?albumview=slideshow
So the deal is that it's supposed to be either the graphics card or maybe the display itself, and in either case it's not worth getting it repaired. Doesn't matter to me these days whether it's worth it or not as I have no $.
But here's the odd thing that no one seems to understand: when the machine is COLD, that's when the lines appear. But if I turn it on and blindly get iTunes going and a youtube video playing via Safari, and then wait for the fan to go on, then restart it a couple of times, the screen comes up perfectly clearly. If I'm actively using the machine for email or writing text or making a CD, the screen will stay just fine all the while. If I'm just listening to something on iTunes and doing nothing else, the lines will return, as they will if I put the machine to sleep.
Been doing this for weeks now and this method enables me to continue using my machine, tho' obviously it's a pain. Anyone KNOW if this still means it's either the graphics card or the display and the machine is definitely terminal? If so, WHY does the heat make it better?
Thanx for any informed opinions.

I've got the same problem. It used to be sporadical before and for instance the machine had worked from November 2008 till May 2009 with no case of this symptom. But then it's got too bad. Now I cannot work on this machine at all so I'm having hard times using my MacBook for Photoshop and InDesign works and the notebook is definitely not fully capable for this. The toughest thing is that no-one knows what the problem is and no-one seems to be interested (I mean Apple specialists). First they put you through all possible resets and launch from the external CD before they believe you the problem is computer, not user. Then they just disappear from discussions. The most relevant information that I heard is that the Video card needs to be replaced. It goes together with the motherboard and costs in total up to $1K. Even if I was sure (and the Apple specialists too) that this will help, I wouldn't pay that much money. At our local dealer they offer iMac 20" 2GHz Intel in Aluminum body for $1.25K which is far more reasonable investment.
I am disappointed with this iMac because I have 2 older ones in the office that are still working fine. I also have 2 newer ones so I just hope they will work. My iMac G5 is so fully functional and up-to-date that I just hate to change it in the recession times. Apple should be more loyal to us, at least 10% of the loyalty that the customers express to this company and it's products.

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